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Benefits
 6 Months Ended
Jun. 30, 2012
Postemployment Benefits [Abstract]  
Benefits
BENEFITS:
Components of Net Periodic Benefit Cost
The following tables set forth the components of net periodic benefit cost of the Company’s postretirement benefit plan for the periods presented:
 
 
Successor
 
 
Predecessor
 
 
Three months
ended
June 30, 2012
 
 
Three months
ended
June 30, 2011
Service cost
 
$
—

 
 
$
638

Interest cost
 
215

 
 
950

Expected return on plan assets
 
(1,107
)
 
 
(950
)
Prior service credit amortization
 
—

 
 
(522
)
Net periodic benefit cost
 
$
(892
)
 
 
$
116

 
 
Successor
 
 
Predecessor
 
 
Period from Acquisition
(March 26, 2012) to June 30, 2012
 
 
Period from
January 1, 2012 to March 25, 2012
 
Six months
ended
June 30, 2011
Service cost
 
$
—

 
 
$
624

 
$
1,275

Interest cost
 
233

 
 
836

 
1,900

Expected return on plan assets
 
(1,199
)
 
 
(918
)
 
(1,900
)
Prior service credit amortization
 
—

 
 
(472
)
 
(1,044
)
Actuarial loss amortization
 
—

 
 
298

 
—

Curtailment recognition  (1)
 
(10,527
)
 
 
—

 
—

Net periodic benefit cost
 
$
(11,493
)
 
 
$
368

 
$
231


(1) 
Subsequent to the Merger, the Company amended certain of its other postretirement employee benefit plans to prospectively restrict participation in the plans for certain active employees.  The plan amendments resulted in the plans becoming currently over-funded and, accordingly, the Company recorded a gross pre-tax curtailment gain of $69.8 million, $59.3 million of which is subject to refund to customers; thus, the net curtailment gain recognition was $10.5 million